ubuntu下安装weka
sudo apt-get install weka
启动weka，控制台打印warning如下：
---Registering Weka Editors---
Trying to add JDBC driver: RmiJdbc.RJDriver - Error, not in CLASSPATH?
Trying to add JDBC driver: jdbc.idbDriver - Error, not in CLASSPATH?
Trying to add JDBC driver: org.gjt.mm.mysql.Driver - Error, not in CLASSPATH?
Trying to add JDBC driver: com.mckoi.JDBCDriver - Error, not in CLASSPATH?
Trying to add JDBC driver: org.hsqldb.jdbcDriver - Error, not in CLASSPATH?
问题原因
These are actually just warnings rather than true errors. The system has some default connection strings for various common databases and Weka does a quick check to see if the appropriate JDBC drivers are available to the system at startup. If you are not planning to connect to MySQL, Hypersonic, instantdb etc. then these messages can safely be ignored.
也就是说，这是weka的例行检查，如果不打算连接数据库，完全可以忽略这些warning信息。
解决办法
- 下载对应的jar包（上面这些都是用于连接不同数据库）
- 修改/usr/bin/weka启动脚本，添加JAVA_CLASSPTH（也可添加在~/.bashrc中）